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Issue Mail forwarding loop - don't understand why

Heppi75

Basic Pleskian
Hi,

I have a problem with a mailbox that respond with mail forwarding loop like this:

Code:
postfix/pipe[14005]: A91FE647CD: to=<mailbox@mydomain.com>, relay=plesk_virtual, delay=0.28, delays=0.27/0/0/0.01, dsn=5.4.6, status=bounced (mail forwarding loop for mailbox@mydomain.com)

The setup in plesk is the following:

mailbox@mydomain.com = Regular Mailbox

info@mydomain2.com (2nd alias office) = Alias Domain for mydomain.com, Both aliases forwarded to mailbox@mydomain.com

That setup results in an mail delivery message to the user that sends a mail to info or office@mydomain2.com?
What is wrong in this setup, can't see why this should be a forwarding loop?

Hope somone could help me, thank you.
 
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